Abstract
The observed Raman intensity measured from carbon nanotubules with well-defined diameters and wall thicknesses of ∼50 and ∼4 nm, respectively, deposited on a self-affine fractal silver surface was found to be enhanced by a factor of ∼1.4–1.7, relative to that of freestanding nanotubules in the absence of silver. Using an analysis in which the calculated distribution of tubules-to-silver distances determined by atomic force microscopy, was convolved with the expected nanotubule-silver distance dependence of the surface enhanced Raman (SERS) enhancement, this observation was reconciled with typical SERS enhancements observed in most silver-adsorbate systems. The analysis also took into account the attenuation of the incident laser intensity, which was determined from the reduction in the resonant Raman background signal that accompanies SERS.
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